#define BUTTON_PIN 14  // Button connected to GPIO 14
#define LED_PIN 15     // LED connected to GPIO 15

volatile bool buttonReleased = false;  // State variable for button press detection
volatile unsigned long lastDebounceTime = 0; // To handle debounce
const unsigned long debounceDelay = 50; // Debounce delay (in milliseconds)

bool LEDState = LOW;  // Stores LED state (ON/OFF)

// Interrupt Service Routine (ISR)
void IRAM_ATTR buttonReleasedInterrupt() {
  unsigned long currentTime = millis(); // Get current time
  if (currentTime - lastDebounceTime > debounceDelay) {
    lastDebounceTime = currentTime; // Update last debounce time
    buttonReleased = true;  // Set flag to handle in the loop
  }
}

void setup() {
  Serial.begin(115200);  // Initialize Serial Monitor
  pinMode(BUTTON_PIN, INPUT_PULLDOWN); // Set button as input with pull-down resistor
  pinMode(LED_PIN, OUTPUT);  // Set LED as output

  attachInterrupt(digitalPinToInterrupt(BUTTON_PIN), buttonReleasedInterrupt, FALLING);
  // Attach interrupt to BUTTON_PIN, trigger when button is released (FALLING edge)
}

void loop() {
  if (buttonReleased) {
    buttonReleased = false;  // Reset flag
    LEDState = !LEDState; // Toggle LED state
    digitalWrite(LED_PIN, LEDState);  // Update LED
    Serial.print("LED State: ");
    Serial.println(LEDState);
  }
}